President Biden has ordered US intelligence agencies to redouble their efforts to pinpoint the origins of Covid-19.
The move comes amid fresh reports that the virus may have emanated from a laboratory in Wuhan.
The President is giving his intelligence officials 90 days to come to an agreed conclusion about how the pandemic began.
From Washington, Simon Marks reports.
IN: "This is a big…."
OUT: "….in the lab"
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